Geometry: Point, Line, and Plane
This is a free lesson from our course in Geometry
This lesson explains basic concepts of Points , Lines and planes. You’ll learn it in the presentation by instructor using video and with the help of several examples with solution. Points, Line, planes, and together with the set will be used in defining other terms. Although these terms are not formally defined or rather defined by usage in most geometries, but their meaning is accepted without definition and are referred to as undefined terms.
A point indicates a place or position and has zero size i.e. it has no length, width or thickness. It is usually indicated by a dot and named with a capital letter. E.g. point A is represented as (•A). (More text below video...)
<h2> Geometry - Point, Line, and Plane </h2> <p> line, point, plane, Geometry, postulate, geometry help, solution, practice questions, quizzes</p> <p> A line is straight and extends infinitely in both directions. The two-headed arrow over AB signifies a line passing through two distinct points A and B.</p>
Other useful lessons:
Line Segment, Ray, Parallel Lines, Pependicular Lines
Midpoint and Congruence
Classifying Angles
(Continued from above) A line is a set of points. The set of points may form curved line, broken line or a straight line and it extends in opposite directions up to infinity. It is represented by,
A straight line can be thought of as a connected set of infinitely many points. It extends infinitely far in two opposite directions and has infinite length, zero width, and zero height. Any two points on the line name it and is written as AB with the symbol on top of two letters. E.g. Line AB is written as
A plane is a set of infinite points forming a connected flat surface and extending infinitely in all directions. Thus a plane has infinite length, width and is usually represented in drawings by a four-sided figure. A single capital letter is used to denote a plane. The word plane is written with the letter to avoid confusion with a point.
Further on following important postulates about point, line and plane are covered:
• one and only one straight line can be drawn that passes through two given points.
• in a plane, two distinct non parallel straight lines will intersect only at one point.
• an infinite number of straight lines can be drawn through a given point in plane. 
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